Sapphire and Gypsum Physical Properties
Tenacity
Not Available
  
Flexible
  
Solubility
insoluble
  
Soluble
  
Durability
Not Available
  
Not Available
  
Specific Gravity
3.95-4.03
  
2.20-2.40
  
Fracture
Uneven, Uneven, Gems, Sixth Edition (2006)
  
Conchoidal, Splintery, Fibrous, UnevenArthur Thomas, Gemstones (2009)
  
Cleavage
None, but may exhibit parting
  
Perfect on {010}, distinct on {100}
  
Mohs Hardness
9
  
2
  
Chemical Composition
Al 2 O 3
  
CaSO 4 -2(H 2O)Arthur Thomas , Gemstones (2009)
  
Sapphire and Gypsum Chemical Formula
While comparing Sapphire and Gypsum physical properties, the important data you should know is its chemical composition. Since chemical formula defines the molecular structure of the crystal, most of the physical properties like color, tenacity, solubility are governed by Sapphire and Gypsum chemical formula.
- Chemical formula of Sapphire- Al 2 O 3
- Chemical formula of Gypsum- CaSO 4 -2(H 2O)Arthur Thomas , Gemstones (2009)
Sapphire and Gypsum Specific Gravity
Another important criteria for qualitative analysis of gemstones is Sapphire and Gypsum Specific gravity. Specific gravity is the relative density of a gemstone compared with respect to density of water. Gemologists use Sapphire and Gypsum Optical Properties during the identification of gemstone. Specific gravity of Sapphire is 2.20-2.40 whereas that of Gypsum is 2.20-2.40.
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